//dom重置样式
body {
    height: 100%;
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif;
    box-sizing: border-box;
    font-size: 12px;
    vertical-align: baseline;
  }

ul,li{
    list-style: none;
}
html,
body,
div,
a,
p{
    padding: 0;
    margin:0
}